CVE-2026-55952: Erlang OTP

TLS 1.3 server denial of service via malformed ClientHello pre-shared key extension

CVSS 8.2 HighEPSS 0.0048 · 41st percentile

Published by the CVE Program (CNA: EEF) at 2 Jul 2026, 16:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Erlang	OTP Package name: ssl pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git	affected 9.5 to before * otp Other versions: unaffected
Erlang	OTP Package name: erlang/otp https://github.com pkg:github/erlang/otp	affected 22.2 to before * otp affected 339a279f02ce38a7b23010e56000613e19abb21f to before * git Other versions: unaffected

Identifiers

CVE-2026-55952

CNA

EEF

Weakness (CWE)

CWE-1284

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (EEF)

CISA KEV Not listed.
EPSS 0.0048, the 41st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 2 Jul 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59 vendor-advisoryrelated
cna.erlef.org/cves/CVE-2026-55952.html related
osv.dev/vulnerability/EEF-CVE-2026-55952 related
www.erlang.org/doc/system/versions.html#order-of-versions version-scheme
github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce patch
github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff patch
github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662 patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.